Improvement in dovetailing-machines



identit gisten JOHN B. SOHMID, 0F SALEBLI'VIRGINIA.

Letters Patent No. 109,674, dated November 29, 1870.

IMPROVEMENT- IN DOVETlLlNG-MACHINES.

The Schedule referred to in these Letters Patent and making part of the same.

Tov all whom it may concern Be it known that I, JOHN B. Scrutin, ot'lSalem, in the county of Roanoke and State of Virginia, have invented a new and improved Dovetailing-Machine;

and I do hereby declare that the-following is a full, clear, and exact description thereof, which will enable others skilled -in the art to make and use the same, reference being had to the accompanying drawing forming partot' this specification.

My invention relates to dovetailing-machines; and It consists in certain improvements, which will first X be described in connection with all that is 'necessary to a full understanding thereof, and then clearly specitied in the claim.

Figure l is a front view of my improved machine 5 Figure 2 is a side 'elevation of the same; and

Figure 3 is a plan of the table and the feedingboard, which is used when the notches are being eut.

Similar letters ot' reference indicate corresponding parts.

A is a vertical frame, which may be arranged and supported in any suitable way; and t B is` a frame, arranged on A to have a vertical movement thereon, which may be caused by toothed racks on the vertical bars thereof, and a shatt,.0, and pinions on it, or` by any other suitable means.

This frame B carries another frame of vertical bars D, and transverse bars B, the .formcrbeing jointed Ato the frame B at F, and the latter being jointed at the ends to the bars D, the one near the upper ends and the other near the lower ends ot' the said bars D.

The bars E carry guides l" for the tool-stocks G,'

the said guides being swiveled t'o the bars so as to turn thereon, for shifting the line of the stocks.

The tool-stocks are connected at the upper ends by swiveled collars H to a bar, I, or cross-head, by which the reciprocating motion is to be imparted to the tools, the said cross-head being connected to the rod K, which is to be worked up and down by suit-able machinery.

The upper ends ot' the tool-stocks are provided with cranks L, connected -to a bar, M, by which they are turned from side to side.

The upper ends of the bars D work behind curved plates M, having three notches in the upper edges for the reception ot' studs a on the bars I), for holding them in the required position for cutting vertical or oblique walls with the chisels. When the studs a of the bars D are in the centernotches the chisels =will work vertically, and when in notches in either. side they will work obliqucly.

For shifting from one notch to another, the frame I B is raised to raise the slide a out of the notches they occupy and to drop them into the others.

The arms )I are attached to the posts of the frame A.

The jointed bars E are designed to be always parallel to the hed, and of course the cross-head must be parallel-with the bars, to allow all the chisels to work down to the table alike; therefore the cross-headis provided with a socketed block, N, for the attachment of the rod K, arranged to rest in a concave seat, 0, in the top of the cross-head,. and to oscillate therein to bring the socket for the rod K into line with it.

The said block has flanges fitting ldown each side of the cross-head, and at the concave seat, and a pin, P, passes through the block and the cross-head to hold them together. A slot is provided in the cross-head for the pin to admit of the oscillation of the block.-

By another "arrangement the block N may be perma-nently att-ached to the cross-head, and have three sockets for the rod K, one socket for each different position for the rod K.

There may be, if preferredthree rods, K, to save the labor of shifting. Y u I Q is a table, for the support of the work. -It is ar ranged in vertical ways It, and may have a shaft,oS,

with pinions gcaringinto racks; or other suitable means'for raising or lowering it maybe required.

This table has two parallel' longitudinal grooves T, at the upper side, connectingwith a wider transversegroove, u, at, the rear end, in which, Hush with the top, is an adjustable plate, V XVV, carrying on 4 the top 'ofthe part Y the pointed guides X, over which a sliding table, Y, with straight grooves in the under side, works and carries the work when the tools are working in the oblique position represented in the drawing, or in the other oblique position to cut the tenons.

The work is held on the table by the pins Z, and the latter is movedalong by 'hand until arrested by suitable stops Z at the rearof the chisels.

When one side of the tenon has beencut inthis way, the work is drawnliack and the chisels are shifted to the other side, and also turned a half revolution on their axis, andthen the work is moved up again.v

By shifting the chisel-supporting frame B higher or lower, the tenonsmay be made wider or narrower, as may be required. The position ofthe chisels not being dependent on the frame B, but on the cross-head I and connecting-rod K, will beshifted laterally by the movement of the frame B up or down.

For cutting the notches for the tenons, the chisels, are adjusted in a vertical position, and the table A- with the triangular points B is used for feeding the work up to the chisels.

The said points are placed against the points of the ribs X when the work on the table is up to the front line ot the chisels; the table being then shoved forward will be caused to move on the oblique line required for one wall of the notches, which'c'orresponds with the oblique wall of the tenon formed by the chisels when working obliquely.`

'For cutting the other wall of the notches, the points B are placed on the other side of the 'point-s x, vand moved forward as before.

The tableA is provided with two sets of points made on different angles for making notches on dif-V ferent angles. y

The plu-te V \V is designed to he adjusted hack and forth in the tixed bed Q, X relatively to the chisels when required, and is provided with clamp-screws c', passing through the bed Q, for holding it in the required position.

'Having thus .describedmy invention,

I claim as new and desire to' secure by Letters l Patent- 1; The arrangement, in a dovetailing-maohine, of the laterally-swinging frames D D E E I, and the for adjusting the'points notched curved plates M M, with respect to a ver-- tically-movahle frame, B, as -and for the purpose specified..

2. The sooketed flanged block N, and concave seat 4 table, Q, and :t horizontally-sliding table, U, of the equal-angled points x, and the table A guiar points B thereon, lied.

having anas :md for the purpose speci- JOH-N B. SGHMID. Witnesses:

A. MCLAVY, J osEPH. HAMMER. 

